diff --git a/examples/optran/F5models.lib b/examples/optran/F5models.lib
index decabbbef..b1e8b3c46 100644
--- a/examples/optran/F5models.lib
+++ b/examples/optran/F5models.lib
@@ -1,6 +1,6 @@
+* The models of this library are in the public domain
 * from https://www.diyaudio.com/forums/solid-state/252973-2sk170-2sj74-spice-model-pass-0-4ma.html
-*2SJ74
-*Toshiba Dep-Mode 20mA 400mW LowNoise pkg:TO-92B 2,1,3
+*2SJ74 Dep-Mode 20mA 400mW LowNoise pkg:TO-92B 2,1,3
 .MODEL 2SJ74 PJF(Beta=92.12m Rs=7.748 Rd=7.748 Lambda=4.464m
 +Vto=-.5428 Cgd=85.67p Pb=.3905 Fc=.5
 +Cgs=78.27p Is=12.98p
diff --git a/examples/optran/models/Models-for-Debian.txt b/examples/optran/models/Models-for-Debian.txt
new file mode 100644
index 000000000..cd75e97d9
--- /dev/null
+++ b/examples/optran/models/Models-for-Debian.txt
@@ -0,0 +1,11 @@
+Device models for Debian
+
+Due to licensing restrictions (incompatibility with DFSG), 
+the device models from TI cannot be part of the Debian distribution.
+You may download the models OPA1611.LIB, TLV6001.LIB, TLV9002.lib,
+opa1656.lib, TLC555.LIB from the TI web pages at
+https://www.ti.com/lit/zip/sbom396
+https://www.ti.com/lit/zip/sboma15
+https://www.ti.com/lit/zip/sbomah7
+https://www.ti.com/lit/zip/sbomaw8
+https://www.ti.com/lit/zip/slfm005
diff --git a/examples/probe/555-timer-2.cir b/examples/probe/555-timer-2.cir
index 8fb2af0dd..968721301 100644
--- a/examples/probe/555-timer-2.cir
+++ b/examples/probe/555-timer-2.cir
@@ -1,4 +1,5 @@
  TIMER 555
+ * The models of this library are in the public domain
  * https://www.electro-tech-online.com/threads/spice-and-555-timer.5806/
  .SUBCKT UA555  32 30 19 23 33 1  21
     *           TR O  R  F  TH D  V
@@ -62,6 +63,7 @@
     * The LM555 timer model is designed for low frequency
     * applications, up to 100Hz.
     .INCLUDE TLC555.LIB
+    * The 555 TI model is available at https://www.ti.com/lit/zip/slfm005 
     .TRAN 10u 100MS
 *    .OPTIONS RELTOL=.0001
     .SAVE  v(16) v(13) v(17)
diff --git a/examples/probe/F5models.lib b/examples/probe/F5models.lib
index 8c396ea03..ef74eb2f5 100644
--- a/examples/probe/F5models.lib
+++ b/examples/probe/F5models.lib
@@ -1,6 +1,6 @@
+* The models of this library are in the public domain
 * from https://www.diyaudio.com/forums/solid-state/252973-2sk170-2sj74-spice-model-pass-0-4ma.html
-*2SJ74
-*Toshiba Dep-Mode 20mA 400mW LowNoise pkg:TO-92B 2,1,3
+*2SJ74 Dep-Mode 20mA 400mW LowNoise pkg:TO-92B 2,1,3
 .MODEL 2SJ74 PJF(Beta=92.12m Rs=7.748 Rd=7.748 Lambda=4.464m
 +Vto=-.5428 Cgd=85.67p Pb=.3905 Fc=.5
 +Cgs=78.27p Is=12.98p