diff --git a/README.md b/README.md
index d53c87b..5d10e5a 100644
--- a/README.md
+++ b/README.md
@@ -22,6 +22,38 @@ This version is a modernization of the original Fortran 77 code. This is a work
 
 Further updates are planned...
 
+### Decision trees
+
+#### Decision tree for systems of nonlinear equations
+
+```mermaid
+flowchart TB
+	start[Is the Jacobian matrix available?]
+	start--Yes-->middle1[Is flexibility required?]
+	start--No-->middle2[Is flexibility required?]
+	middle1--Yes-->b1[<a href='https://fortran-lang.github.io/minpack/proc/hybrj.html'>hybrj</a>]
+	middle1--No-->b2[<a href='https://fortran-lang.github.io/minpack/proc/hybrj1.html'>hybrj1</a>]
+	middle2--Yes-->b3[<a href='https://fortran-lang.github.io/minpack/proc/hybrd.html'>hybrd</a>]
+	middle2--No-->b4[<a href='https://fortran-lang.github.io/minpack/proc/hybrd1.html'>hybrd1</a>]
+```
+
+#### Decision tree for nonlinear least squares problems
+
+```mermaid
+flowchart TB
+	start[Is the Jacobian matrix available?]
+	start--Yes-->m1[Is storage limited?]
+	start--No-->m2[Is flexibility required?]
+	m1--Yes-->ml1[Is flexibility required?]
+	m1--No-->ml2[Is flexibility required?]
+	ml1--Yes-->b1[<a href='https://fortran-lang.github.io/minpack/proc/lmstr.html'>lmstr</a/>]
+	ml1--No-->b2[<a href='https://fortran-lang.github.io/minpack/proc/lmstr1.html'>lmstr1</a/>]
+	ml2--Yes-->b3[<a href='https://fortran-lang.github.io/minpack/proc/lmder.html'>lmder</a/>]
+	ml2--No-->b4[<a href='https://fortran-lang.github.io/minpack/proc/lmder1.html'>lmder1</a/>]
+	m2--Yes-->mr1[<a href='https://fortran-lang.github.io/minpack/proc/lmdif.html'>lmdif</a/>]
+	m2--No-->mr2[<a href='https://fortran-lang.github.io/minpack/proc/lmdif1.html'>lmdif1</a/>]
+```
+
 ### Documentation
 
  * The API documentation for the latest default branch can be found [here](https://fortran-lang.github.io/minpack/).  This is generated by processing the source files with [FORD](https://github.com/Fortran-FOSS-Programmers/ford).