diff --git a/docs/install.md b/docs/install.md
index e5e086e..5afb877 100644
--- a/docs/install.md
+++ b/docs/install.md
@@ -10,6 +10,11 @@ Python modules (installed via setup.py):
 * Pysam (>=0.8.1)
 * Pandas (>=0.17.1)
 
+External binaries (included with package):
+* Bowtie2 (2.3.2)  
+* samtools (1.4)  
+* hs-blastn
+
 ### Speed and memory usage
 Most steps of the program are quite fast, require < 2Gb of RAM, and are compatible with multithreading. For a typical gut metagenome, expect ~30 minutes for species profiling and 60-90 minutes each for calling nucleotide and gene copy number variants.