diff --git a/src/pulse/channelmap.h b/src/pulse/channelmap.h
index da46556f3..47d2514b6 100644
--- a/src/pulse/channelmap.h
+++ b/src/pulse/channelmap.h
@@ -351,7 +351,7 @@ mapping, i.e.\ "Stereo", "Surround 7.1" and so on. If the channel
 mapping is unknown NULL will be returned. \since 0.9.15 */
 const char* pa_channel_map_to_pretty_name(const pa_channel_map *map) PA_GCC_PURE;
 
-/** Returns true if the specified channel position is available at
+/** Returns non-zero if the specified channel position is available at
  * least once in the channel map. \since 0.9.16 */
 int pa_channel_map_has_position(const pa_channel_map *map, pa_channel_position_t p) PA_GCC_PURE;
 
diff --git a/src/pulse/volume.h b/src/pulse/volume.h
index fa952c6d1..1e1beb4e6 100644
--- a/src/pulse/volume.h
+++ b/src/pulse/volume.h
@@ -224,7 +224,7 @@ pa_volume_t pa_cvolume_min(const pa_cvolume *a) PA_GCC_PURE;
  * \since 0.9.16 */
 pa_volume_t pa_cvolume_min_mask(const pa_cvolume *a, const pa_channel_map *cm, pa_channel_position_mask_t mask) PA_GCC_PURE;
 
-/** Return true when the passed cvolume structure is valid, false otherwise */
+/** Return non-zero when the passed cvolume structure is valid */
 int pa_cvolume_valid(const pa_cvolume *v) PA_GCC_PURE;
 
 /** Return non-zero if the volume of all channels is equal to the specified value */