added some documentation
diff --git a/src/pcm.c b/src/pcm.c
index 076393f..565e34b 100644
--- a/src/pcm.c
+++ b/src/pcm.c
@@ -620,7 +620,7 @@
     return NULL;
 }
 
-/** Frees the hardware parameters returned by @ref pcm_params_open.
+/** Frees the hardware parameters returned by @ref pcm_params_get.
  * @param pcm_params Hardware parameters of a PCM.
  *  May be NULL.
  * @ingroup libtinyalsa-pcm