diff --git a/src/core/strong_typedef_type.hpp b/src/core/strong_typedef_type.hpp
index b88f343599..a89ec0460f 100644
--- a/src/core/strong_typedef_type.hpp
+++ b/src/core/strong_typedef_type.hpp
@@ -116,11 +116,11 @@ namespace StrongType {
 	 * Templated helper to make a type-safe 'typedef' representing a single POD value.
 	 * A normal 'typedef' is not distinct from its base type and will be treated as
 	 * identical in many contexts. This class provides a distinct type that can still
-	 * be assign from and compared to values of its base type.
+	 * be assigned from and compared to values of its base type.
 	 *
 	 * Example usage:
 	 *
-	 *   using MyType = StrongType::Typedef<int, struct MyTypeTag, StrongType::Explicit, StrongType::Compare, StrongType::Integer>;
+	 *   using MyType = StrongType::Typedef<int, struct MyTypeTag, StrongType::Compare, StrongType::Integer>;
 	 *
 	 * @tparam TBaseType Type of the derived class (i.e. the concrete usage of this class).
 	 * @tparam TTag An unique struct to keep types of the same TBaseType distinct.
diff --git a/src/dropdown_common_type.h b/src/dropdown_common_type.h
index 71becf9fa1..508de7eb29 100644
--- a/src/dropdown_common_type.h
+++ b/src/dropdown_common_type.h
@@ -172,7 +172,7 @@ public:
 /**
  * Drop down indent component.
  * @tparam TBase Base component.
- * @tparam TEnd Position checkmark at end if true, or start if false.
+ * @tparam TEnd Position indent at end if true, or start if false.
  */
 template <class TBase, bool TEnd = false>
 class DropDownIndent : public TBase {
diff --git a/src/newgrf.cpp b/src/newgrf.cpp
index 190ac269b0..7e20b20585 100644
--- a/src/newgrf.cpp
+++ b/src/newgrf.cpp
@@ -556,7 +556,7 @@ static StringID TTDPStringIDToOTTDStringIDMapping(GRFStringID str)
  * Used when setting an object's property to map to the GRF's strings
  * while taking in consideration the "drift" between TTDPatch string system and OpenTTD's one
  * @param grfid Id of the grf file.
- * @param str StringID that we want to have the equivalent in OoenTTD.
+ * @param str GRF-local GRFStringID that we want to have the equivalent in OpenTTD.
  * @return The properly adjusted StringID.
  */
 StringID MapGRFStringID(uint32_t grfid, GRFStringID str)
@@ -4632,6 +4632,7 @@ static ChangeInfoResult RailTypeReserveInfo(uint first, uint last, int prop, Byt
  * @param last Local ID of the last roadtype.
  * @param prop The property to change.
  * @param buf The property value.
+ * @param rtt Road/tram type.
  * @return ChangeInfoResult.
  */
 static ChangeInfoResult RoadTypeChangeInfo(uint first, uint last, int prop, ByteReader &buf, RoadTramType rtt)
diff --git a/src/viewport.cpp b/src/viewport.cpp
index 3ea84802c1..7405fce2d9 100644
--- a/src/viewport.cpp
+++ b/src/viewport.cpp
@@ -1311,7 +1311,6 @@ static void ViewportAddLandscape()
 /**
  * Add a string to draw in the current viewport.
  * @param dpi current viewport area
- * @param small_from Zoomlevel from when the small font should be used
  * @param sign sign position and dimension
  * @param flags ViewportStringFlags to control the string's appearance.
  * @param colour colour of the sign background; or INVALID_COLOUR if transparent
@@ -1376,7 +1375,7 @@ static void ViewportAddTownStrings(DrawPixelInfo *dpi, const std::vector<const T
 /**
  * Add sign strings to a viewport.
  * @param dpi Current viewport area.
- * @param towns List of signs to add.
+ * @param signs List of signs to add.
  * @param small Add small versions of strings.
  */
 static void ViewportAddSignStrings(DrawPixelInfo *dpi, const std::vector<const Sign *> &signs, bool small)
@@ -1400,7 +1399,7 @@ static void ViewportAddSignStrings(DrawPixelInfo *dpi, const std::vector<const S
 /**
  * Add station strings to a viewport.
  * @param dpi Current viewport area.
- * @param towns List of stations to add.
+ * @param stations List of stations to add.
  * @param small Add small versions of strings.
  */
 static void ViewportAddStationStrings(DrawPixelInfo *dpi, const std::vector<const BaseStation *> &stations, bool small)
@@ -1963,6 +1962,7 @@ static void ClampSmoothScroll(uint32_t delta_ms, int64_t delta_hi, int64_t delta
 /**
  * Update the viewport position being displayed.
  * @param w %Window owning the viewport.
+ * @param delta_ms Milliseconds since the last update.
  */
 void UpdateViewportPosition(Window *w, uint32_t delta_ms)
 {
diff --git a/src/widget_type.h b/src/widget_type.h
index 5d7d297206..ef16ab55e5 100644
--- a/src/widget_type.h
+++ b/src/widget_type.h
@@ -959,7 +959,9 @@ inline uint ComputeMaxSize(uint base, uint max_space, uint step)
  *   Next, specify its properties with one or more of
  *   - #SetMinimalSize Define the minimal size of the widget.
  *   - #SetFill Define how the widget may grow to make it nicely.
- *   - #SetDataTip Define the data and the tooltip of the widget.
+ *   - #SetStringTip Define the string and the tooltip of the widget.
+ *   - #SetSpriteTip Define the sprite ID and the tooltip of the widget.
+ *   - #SetToolTip Define the tooltip of the widget.
  *   - #SetResize Define how the widget may resize.
  *   - #SetPadding Create additional space around the widget.
  *