diff --git a/libpostproc/postprocess_internal.h b/libpostproc/postprocess_internal.h
index 33c5f6932bf7a..82a96ff6d111f 100644
--- a/libpostproc/postprocess_internal.h
+++ b/libpostproc/postprocess_internal.h
@@ -20,7 +20,7 @@
 
 /**
  * @file
- * internal api header.
+ * internal API header.
  */
 
 #ifndef POSTPROC_POSTPROCESS_INTERNAL_H
@@ -53,7 +53,7 @@
 #define H_X1_FILTER     0x2000                  // 8192
 #define H_A_DEBLOCK     0x4000
 
-/// select between full y range (255-0) or standart one (234-16)
+/// select between full y range (255-0) or standard one (234-16)
 #define FULL_Y_RANGE    0x8000                  // 32768
 
 //Deinterlacing Filters
@@ -80,7 +80,7 @@ static inline int CLIP(int a){
     else      return a;
 }
 /**
- * Postprocessng filter.
+ * Postprocessing filter.
  */
 struct PPFilter{
     const char *shortName;
@@ -92,15 +92,15 @@ struct PPFilter{
 };
 
 /**
- * Postprocessng mode.
+ * Postprocessing mode.
  */
 typedef struct PPMode{
-    int lumMode;                    ///< acivates filters for luminance
-    int chromMode;                  ///< acivates filters for chrominance
+    int lumMode;                    ///< activates filters for luminance
+    int chromMode;                  ///< activates filters for chrominance
     int error;                      ///< non zero on error
 
-    int minAllowedY;                ///< for brigtness correction
-    int maxAllowedY;                ///< for brihtness correction
+    int minAllowedY;                ///< for brightness correction
+    int maxAllowedY;                ///< for brightness correction
     float maxClippedThreshold;      ///< amount of "black" you are willing to lose to get a brightness-corrected picture
 
     int maxTmpNoise[3];             ///< for Temporal Noise Reducing filter (Maximal sum of abs differences)