diff --git a/alsaaudio.c b/alsaaudio.c
index 76c0ffe..caadfdf 100644
--- a/alsaaudio.c
+++ b/alsaaudio.c
@@ -2478,6 +2478,10 @@ PyObject *PyInit_alsaaudio(void)
     _EXPORT_INT(m, "PCM_FORMAT_IMA_ADPCM",SND_PCM_FORMAT_IMA_ADPCM);
     _EXPORT_INT(m, "PCM_FORMAT_MPEG",SND_PCM_FORMAT_MPEG);
     _EXPORT_INT(m, "PCM_FORMAT_GSM",SND_PCM_FORMAT_GSM);
+    _EXPORT_INT(m, "PCM_FORMAT_S24_3LE",SND_PCM_FORMAT_S24_3LE);
+    _EXPORT_INT(m, "PCM_FORMAT_S24_3BE",SND_PCM_FORMAT_S24_3BE);
+    _EXPORT_INT(m, "PCM_FORMAT_U24_3LE",SND_PCM_FORMAT_U24_3LE);
+    _EXPORT_INT(m, "PCM_FORMAT_U24_3BE",SND_PCM_FORMAT_U24_3BE);
 
      /* DSD sample formats are included in ALSA 1.0.29 and higher
       * define OVERRIDE_DSD_COMPILE to include DSD sample support
diff --git a/doc/libalsaaudio.rst b/doc/libalsaaudio.rst
index ce08867..dc4527b 100644
--- a/doc/libalsaaudio.rst
+++ b/doc/libalsaaudio.rst
@@ -193,10 +193,10 @@ PCM objects have the following methods:
    ``PCM_FORMAT_S16_BE``      Signed 16 bit samples for each channel (Big Endian byte order)
    ``PCM_FORMAT_U16_LE``      Unsigned 16 bit samples for each channel (Little Endian byte order)
    ``PCM_FORMAT_U16_BE``      Unsigned 16 bit samples for each channel (Big Endian byte order)
-   ``PCM_FORMAT_S24_LE``      Signed 24 bit samples for each channel (Little Endian byte order)
-   ``PCM_FORMAT_S24_BE``      Signed 24 bit samples for each channel (Big Endian byte order)}
-   ``PCM_FORMAT_U24_LE``      Unsigned 24 bit samples for each channel (Little Endian byte order)
-   ``PCM_FORMAT_U24_BE``      Unsigned 24 bit samples for each channel (Big Endian byte order)
+   ``PCM_FORMAT_S24_LE``      Signed 24 bit samples for each channel (Little Endian byte order in 4 bytes)
+   ``PCM_FORMAT_S24_BE``      Signed 24 bit samples for each channel (Big Endian byte order in 4 bytes)
+   ``PCM_FORMAT_U24_LE``      Unsigned 24 bit samples for each channel (Little Endian byte order in 4 bytes)
+   ``PCM_FORMAT_U24_BE``      Unsigned 24 bit samples for each channel (Big Endian byte order in 4 bytes)
    ``PCM_FORMAT_S32_LE``      Signed 32 bit samples for each channel (Little Endian byte order)
    ``PCM_FORMAT_S32_BE``      Signed 32 bit samples for each channel (Big Endian byte order)
    ``PCM_FORMAT_U32_LE``      Unsigned 32 bit samples for each channel (Little Endian byte order)
@@ -210,6 +210,10 @@ PCM objects have the following methods:
    ``PCM_FORMAT_IMA_ADPCM``   A 4:1 compressed format defined by the Interactive Multimedia Association.
    ``PCM_FORMAT_MPEG``        MPEG encoded audio?
    ``PCM_FORMAT_GSM``         9600 bits/s constant rate encoding for speech
+   ``PCM_FORMAT_S24_3LE``     Signed 24 bit samples for each channel (Little Endian byte order in 3 bytes)
+   ``PCM_FORMAT_S24_3BE``     Signed 24 bit samples for each channel (Big Endian byte order in 3 bytes)
+   ``PCM_FORMAT_U24_3LE``     Unsigned 24 bit samples for each channel (Little Endian byte order in 3 bytes)
+   ``PCM_FORMAT_U24_3BE``     Unsigned 24 bit samples for each channel (Big Endian byte order in 3 bytes)
    =========================  ===============
    
 
diff --git a/playwav.py b/playwav.py
index 48a52ae..1940b40 100755
--- a/playwav.py
+++ b/playwav.py
@@ -24,7 +24,7 @@ def play(device, f):
     elif f.getsampwidth() == 2:
         device.setformat(alsaaudio.PCM_FORMAT_S16_LE)
     elif f.getsampwidth() == 3:
-        device.setformat(alsaaudio.PCM_FORMAT_S24_LE)
+        device.setformat(alsaaudio.PCM_FORMAT_S24_3LE)
     elif f.getsampwidth() == 4:
         device.setformat(alsaaudio.PCM_FORMAT_S32_LE)
     else: