diff --git a/ext/opencv/cvmat.cpp b/ext/opencv/cvmat.cpp
index a210a94..7b38990 100644
--- a/ext/opencv/cvmat.cpp
+++ b/ext/opencv/cvmat.cpp
@@ -583,7 +583,7 @@ prepare_decoding(int argc, VALUE *argv, int* iscolor, int* need_release)
  * Reads an image from a buffer in memory.
  *
  * Parameters:
- *   buf <CvMat, Array> - Input array
+ *   buf <CvMat, Array, String> - Input array
  *   iscolor <Integer> - Flags specifying the color type of a decoded image (the same flags as CvMat#load)
  */
 VALUE
diff --git a/ext/opencv/iplimage.cpp b/ext/opencv/iplimage.cpp
index ecc00d7..3ccd4a0 100644
--- a/ext/opencv/iplimage.cpp
+++ b/ext/opencv/iplimage.cpp
@@ -138,7 +138,7 @@ rb_load_image(int argc, VALUE *argv, VALUE self)
 
 /*
  * call-seq:
- *   decode_image(buf[, iscolor=CV_LOAD_IMAGE_COLOR]) -> CvMat
+ *   decode_image(buf[, iscolor=CV_LOAD_IMAGE_COLOR]) -> IplImage
  *
  * Reads an image from a buffer in memory.
  *